config: Add 'config_file' parameter to ConfigFileFinder

The `--config` flag is passed into `MergedConfigParser.parse()` and the
module-level function `config.get_local_plugins()`.  Since both of these
places utilize the `ConfigFileFinder` object and the configuration file
override pertains to how configuration behaves, this incremental change
directly associates the `ConfigFileFinder` and the configuration file
override.

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/unit/test_config_file_finder.py b/tests/unit/test_config_file_finder.py
index d03118a..93d515a 100644
--- a/tests/unit/test_config_file_finder.py
+++ b/tests/unit/test_config_file_finder.py
@@ -127,6 +127,23 @@ def test_read_config_catches_decoding_errors(tmpdir):
     assert parsed == []
 
 
+def test_config_file_default_value():
+    """Verify the default 'config_file' attribute value."""
+    finder = config.ConfigFileFinder('flake8', [])
+    assert finder.config_file is None
+
+
+def test_setting_config_file_value():
+    """Verify the 'config_file' attribute matches constructed value."""
+    config_file_value = 'flake8.ini'
+    finder = config.ConfigFileFinder(
+        'flake8',
+        [],
+        config_file=config_file_value,
+    )
+    assert finder.config_file == config_file_value
+
+
 def test_ignore_config_files_default_value():
     """Verify the default 'ignore_config_files' attribute value."""
     finder = config.ConfigFileFinder('flake8', [])